Method and device in reel change

ABSTRACT

A paper web reeled on a reeling core is affected to form a reel at least by means of the torque of a reeling cylinder and the nip load, wherein in connection with the reel change a new reeling core is brought in nip contact with the reeling cylinder above the reeling cylinder, together with a change device especially a so-called gooseneck. During the reel change an adhesive or the like is applied between the layers of the paper web in connection with the cutting of the paper web by means of a cutting device. The adhesive or the like is applied on the surface of the reel that is being formed by means of a member applying the adhesive.

CROSS REFERENCES TO RELATED APPLICATIONS

This application is a US national stage application of PCT ApplicationNo. PCT/FI00/01016, filed Nov. 23, 2000, and claims priority on FinnishApplication No. 19992513, filed Nov. 25, 1999, the disclosures of bothof which applications are incorporated by reference herein.

STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSOREDRESEARCH AND DEVELOPMENT

Not applicable.

BACKGROUND OF THE INVENTION

The invention relates to a method in reel change, in which a paper webto be reeled on a reeling core is affected at least by the torque of thereeling cylinder and the nip load to form a reel, wherein in connectionwith the reel change, a new reeling core is brought in nip contact withthe reeling cylinder above the reeling cylinder together with a changedevice, especially a so-called gooseneck, and wherein an adhesive, orthe like, is applied between the paper web layers during the reel changein connection with the cutting of the paper web by means of a cuttingdevice.

As for the state of the art, reference is made to publication FI-B102826, which discloses a method in reeling up a paper or paper boardweb, in which the paper web is supported during the reeling by means ofa belt traveling via a nip between the reeling cylinder and the reelshaft. In connection with the reel change, an adhesive is sprayed on thepaper web passed to the reel at the same time the paper web is cut. Insaid publication the adhesive is spread on the web passed to the reelwithin a fixed distance from the cutting line. Such a method isadvantageous as such especially in so-called high-speed reeling, inwhich the web speeds exceed 1600 m/min. In cases where the web travelsat high speed, the method according to the publication FI-B 102826 canbe applied without actual drawbacks especially for such paper grades, inwhich the absorption of the adhesive is insignificant.

Advantageously, but not solely, the present invention relates to amethod to be applied in connection with a Pope-type reel-up. ThePope-type reel-up is the oldest of the reel-up types currently in use.The function of the Pope-type reel-up is based on one roll that isdriven, i.e. a reeling cylinder, and a paper reel pressed against thesame and formed around a reeling core. The paper reel that is beingformed rotates by means of friction between the reeling cylinder and thepaper.

A surface drive reel-up based on the Pope method is advantageous in theproduction of relatively small reels, when the paper is not sensitive tothe linear load. The paper also has to be sufficiently compressible. Assuch, the Pope-type reel-up has a very simple structure and it functionsin a reliable manner. By means of the Pope method, the reel change istypically conducted with a change device, especially with a so-calledgooseneck. In the gooseneck change a small, crosswise cut is made to thepaper web before the reeling cylinder by means of a cutting device. Thecut functions as an initial tear when the paper web is lifted around anew reeling core by means of a blow nozzle at the end of the gooseneck.In the Pope-type reel-up the web speeds vary between approximately 300and 1500 m/min. However, a drawback occurring in the act of applying thePope method is that the surface layers of the reel reeled on the reelingcore tend to slacken. There have been no suggestion as to how to keeptight the layers of a full reel reeled on the reeling core. This maycause significant production losses, the scope of which is primarilydetermined on the basis of the running speed and the smoothness of thepaper web.

In addition to the Pope method, reeling methods are also used in which athird control variable is used in addition to the surface drive, i.e. acentre-drive apparatus placed in connection with the reeling core, aswell as possibly a device for finishing the surface of the reel. Themethod according to the invention is also suitable to be used inconnection with these more developed methods.

The above-mentioned special properties, especially those of Pope methodas well as the problems occurring in the act of applying the same, haveled up to the present invention. The method disclosed in the publicationFI-B 102826, in which an adhesive is sprayed on a web passed to thereel, contains several drawbacks especially in view of the generaltechnology applied in the Pope-type reel-ups and the paper gradesgenerally used in Pope-type reel-ups. Especially in view of thecontinuity of the reeling, it is important to prevent the access ofadhesive on the surface of the reeling cylinder in all conditions. Theaccess of the adhesive on the surface of the reeling cylinder almostwithout exception causes a production break, which can even be along-lasting one.

SUMMARY OF THE INVENTION

To eliminate the above-presented problems and especially to improve thestate of the art in the technology applied in connection with so-calledPope-type reel-ups, as well as to produce new, advantageouspossibilities in relation to reel change in other reeling up methods,the method according to the invention is primarily characterized in thatthe adhesive, or the like, is applied on the surface of the reel that isbeing formed. By means of this arrangement it is in all conditionspossible to substantially minimize the possibility that the adhesiveapplied on the paper would be released on the surface of the reelingcylinder, even though e.g. the driving speeds were low and the papergrade porous, as is characteristic to the Pope method in particular. Ifthe adhesive is absorbed in the paper, the absorption is most likelydirected towards the centre boss of the paper reel that is being formed,because the adhesive is applied on the surface of the reel that is beingformed when it has already passed the reeling cylinder. On the otherhand, in the nip point of the reel-up a “protective” paper web is placedon the adhesive applied on the surface of the paper reel that is beingformed and the contact point of the adhesive with the reeling cylinderis linear and of a very short duration, due to the nature of the nip,wherein the transfer of the adhesive through the paper web through the“protective” paper web to the reeling cylinder is very unlikely becauseof the aforementioned act of applying the adhesive on the surface of thereeling cylinder before the nip contact in the travel direction of thepaper web.

It is particularly advantageous that the member applying the adhesive isplaced in connection with a change device, especially a so-calledgooseneck. The adhesive is applied to the paper reel that is beingformed in connection with the reel change, immediately before thecutting of the paper web, wherein the change device used in thethreading of the paper web to the new reeling core is a so-calledgooseneck. The gooseneck is placed in the change station before thecutting of the paper web, wherein the member applying the adhesive canbe advantageously placed at the same point of location. The moment oftransferring the gooseneck to the change station does not have to besubstantially changed.

The invention also relates to a device in reeling up: The device isprimarily characterized in that the member applying the adhesive isarranged to apply the adhesive on the surface of the reel that is beingformed.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described in more detail with reference to theappended drawings, in which FIGS. 1 and 2 show a schematical side-viewof two embodiments according to the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 schematically shows a Pope-type reel-up comprising a reeling core1 by means of which a paper web PR that is being reeled is affected toform a reel R. The function of the reeling cylinder 1 is, on one hand,based on torque M1 attained by means of the centre drive of the same,and on the other hand on a nip load N, which has a linear effect in theembodiment between the reeling cylinder and the reel R that is beingformed. In connection with the change of the reel R, a new reeling core3 is brought in nip contact NK with the reeling cylinder 1, above thereeling cylinder 1 together with a change device 4, i.e. a so-calledgooseneck. In the situation of FIG. 1 the process has nearly proceededto the reel change state.

During the change sequence of the reel R, an adhesive is applied betweenthe paper layers (adhesive jet 5 in FIG. 1) in connection with thecutting of the paper web PR by means of a cutting device 7. In theembodiment of the invention according to FIG. 1, the adhesive (jet 5) isapplied on the surface P of the reel R that is being formed, above thenip contact NK.

As can be seen in FIG. 1, the member 6 applying the adhesive (normallycomprising three to four nozzles) is in this embodiment placed inconnection with the gooseneck 4. The adhesive is applied on the surfaceof the reel R that is being formed immediately before the nip contact NKin the travel direction of the paper web PR (arrow KS). The adhesive isapplied by means of a jet, wherein the adhesive jet which produces anadhesive stripe on the surface P of the reel R that is being formed, isin the presented embodiment produced diagonally downwards from above thenip contact NK.

The act of applying the adhesive is stopped before, but advantageouslysubstantially at the same time the operation of the cutting device 7 isstarted. The cutting device 7 is placed before the reeling cylinder 1 inthe travel direction of the paper web PR, within a distance from themember applying the adhesive. In the portioning of the adhesive it ispossible to use one or more nozzles placed in connection with the changedevice 4, which nozzles can be positioned in such a manner that theyproduce a fan-like formation, wherein it is possible to supply severaladhesive jets producing an adhesive stripe on the surface P of the reelR that is being formed, thus increasing the hold or attaining a strongeradherence by means of spraying the adhesive for a shorter period oftime.

Most advantageously, the operating power of the pneumatically operatednozzles spraying the adhesive is attained from the gooseneck operatingas a change device, in which pressurized air is already used. Theadhesive can be conveyed via a pipework from a container located closeto the Pope-type reel-up. To increase the pressure of the adhesive sothat it is sufficient in view of applying the same, it is possible toplace a pump close to the nozzles. The adhesive can be applied via thenozzles by starting the blowing from the gooseneck, wherein thepressurized air in use can be utilized as operating power of thenozzles. Each portioned adhesive stripe covers typically approximately ¼of the length of the perimeter of the reel R. If a stronger hold isnecessary, it is possible to increase the supply time of the adhesivethereby lengthening the adhesive stripe. The fact that the supply of theadhesive is stopped when the cutting device produces a cut, ensures thatthe adhesive remains underneath the surface layers of the paper web PRand does not enter in contact e.g. with the surface layers of the paperweb PR, thereby not being able to touch the outer surface of the reelingcylinder.

FIG. 2 shows an embodiment of the method according to the invention in areel-up equipped with a centre-driven KK (torque M2) reeling core 2,said reel-up naturally also comprising the drives used in the reel-upaccording to FIG. 1. The parts corresponding to the embodiment of FIG.1, are marked with corresponding reference numerals in FIG. 2. Thestructure according to FIG. 2 deviates from the structure of FIG. 1 inthat respect that the member 6 applying the adhesive is placed inside abox-like pulper shield 8 with a triangular cross-section. In thisembodiment, the member 6 applying the adhesive comprises three to fournozzles placed at fixed intervals substantially next to each otherinside the pulper shield 8 whose length equals the length of the reelingcylinder. The pulper shield 8 is provided with a perforation 9 at thepoint of location of the nozzles, i.e. in the surface 8 a of thetriangular cross-section directed diagonally upward and towards thereeling cylinder 1, in the closed position of the pulper shield 8, viawhich the adhesive jets 5 are directed upwards, in the presentedembodiment diagonally upwards on the surface P of the reel R after thenip contact in the travel direction of the paper web PR. Thus, theadhesive stripes (marked with a bold line in FIG. 2), substantiallycircle the outer perimeter of the reel R that is being formed.

FIG. 2 also presents a central processing unit 10 which is, forinstance, utilized to control the act of applying the method accordingto the invention. The central processing unit 10 is connected (line 11in FIG. 2) on one hand to the member 6 applying the adhesive and on theother hand to the cutting device 7 (line 12 in FIG. 2). The applying ofthe adhesive by means of the member 6 is stopped by means of a controlcommand by the central processing unit 10 before, but advantageouslysubstantially at the same time the operation of the cutting device 7 isstarted. The cutting device 7 is placed before the reeling cylinder 1 inthe travel direction of the paper web PR, as in the embodiment of FIG.1. The pressurized (pressure source 13) supply storage 14 of theadhesive is placed in transfer connection of the adhesive (line 15 inFIG. 2) with the member 6 applying the adhesive. The supply storage 14can be a bag (cartridge-like) containing the adhesive, which is placedin the pressure space within the area of influence of the pressure ofthe pressure source 13, wherein the pressure compresses the bag thusproducing a working pressure in the nozzles constituting the member 6applying the adhesive, the operation of which nozzles is controlled byon/off principle by means of valves in connection with said nozzles. Thebag constituting the supply storage 14 thus prevents the drying of theadhesive.

The agent effecting the operation according to the invention can also becalled a binding agent, because adhesive properties, by means of whichthe layers of the paper web PR adhere to each other, are not necessarilyrequired as such of said medium, but said medium has such an effect thatit generates such changes in the surface of paper web layers positionednext to each other, that the layers adhere to each other. Thus, thebinding agent binding the paper web layers together can be for examplewater. An advantageous adhesive, thanks to its pulpability, is starchdissolved or dispersed in water. In view of applying the methodaccording to the invention, it is important that the adhesive forms ascoherent a flow as possible, so that the drying would be as slight aspossible, before the paper web layers are bound together, to attain thebest possible adherence. This is especially important in the embodimentaccording to FIG. 2, in which adhesive stripe(s) or the like are exposedto drying for a considerably longer period of time as in the embodimentof FIG. 1. In this respect, a dripping adhesive jet is typically notadvantageous, because a large free surface area is generated in thedripping jet, which accelerates the drying process.

1. A method in reel change, comprising the steps of: passing a paper webin a travel direction towards a rotating reel; reeling the paper web toform layers on a reeling core to form the rotating reel with a reelingcylinder having a torque, the reeling cylinder forming a nip with therotating reel; affecting the paper web on the reel being formed at leastby means of the torque of the reeling cylinder and a nip load; bringinga new reeling core in nip contact with the reeling cylinder; applying anadhesive or a binding agent on a surface of the paper web which is woundon the rotating reel that is being formed, wherein said surface havingfirst passed through the nip formed by the rotating reel and the reelingcylinder; binding the paper web on the surface of the rotating reel bymeans of the adhesive or the binding agent by causing it to remainbetween the layers of the paper web on the rotating reel; cutting thepaper web running to the rotating reel being formed; and stopping theapplication of the adhesive or binding agent on the surface of therotating reel before or substantially simultaneously with cutting thepaper web.
 2. The method of claim 1 wherein a change device is used inconnection with the new reeling core for threading the paper web to thenew reeling core.
 3. The method of claim 2 wherein the adhesive or thebinding agent is applied from a member placed in connection with thechange device.
 4. The method of claim 1 wherein the adhesive or thebinding agent is placed on the surface of the paper web which is woundon the rotating reel that is being formed immediately before the webenters the nip contact between the rotating reel being formed and thereeling cylinder for a second time.
 5. The method of claim 1 wherein theadhesive or the binding agent is applied on the surface of the rotatingreel that is being formed immediately after said surface has firstpassed through the nip formed by the reel and the reeling cylinder. 6.The method of claim 1 wherein the adhesive or the binding agent isapplied from a member placed in connection with a pulper shield.
 7. Themethod of claim 1 wherein the cutting of the web is performed before thereeling cylinder in the travel direction of the paper web, within aselected distance from a member applying the adhesive or the bindingagent.
 8. A method in reel change, comprising the steps of: passing apaper web in a travel direction towards a rotating reel; reeling thepaper web to form layers on a reeling core to form the rotating reelwith a reeling cylinder having a torque, the reeling cylinder forming anip with the rotating reel and the paper web passing through the nipbefore forming the layers on the reeling core; affecting the paper webon the reel being formed at least by means of the torque of the reelingcylinder and a nip load applied at the nip between the reeling cylinderand the rotating reel; bringing a new reeling core in nip contact withthe reeling cylinder; applying an adhesive or a binding agent on asurface of the paper web which is wound on the rotating reel that isbeing formed, wherein said surface having first passed through the nipformed by the reel and the reeling cylinder; cutting the paper webrunning to the reel being formed; binding a further portion of the paperweb on to the surface of the paper web which is wound on the rotatingreel by winding said further portion of the paper web on the adhesive orthe binding agent applied on the surface of the paper web which is woundon the rotating reel, the further portion of the paper web forming asurface layer; and causing the adhesive or the binding agent to remainunderneath the surface layer so that the adhesive or the binding agentis not able to touch the outer surface of the reeling cylinder.
 9. Areeling device, comprising: a reeling core, and a paper web extendingaround it to form a reel having a surface formed of said paper web; areeling cylinder arranged in nip contact with said reel, wherein the theweb extends through the nip contact; means for bringing a new reelingcore in nip contact with said reeling cylinder; a cutting device of thepaper web; and a member arranged to apply an adhesive or a binding agentto a surface of the paper web after the surface of the web has passedthrough the nip contact during the rotation of the reel, and wherein themember is fixed to a change device used in threading of the paper web tothe new reeling core wherein the member is arranged to apply theadhesive or the binding agent in a direction away from the new reelingcore and toward the reel.
 10. The device of claim 9, wherein the changedevice is a gooseneck.
 11. The device of claim 9, wherein the memberarranged to apply the adhesive or binding agent comprises one or morenozzles.
 12. The device of claim 11, wherein said one or more nozzlesare operated by means of pressurized air, and their operating power isarranged to be taken directly from the change device or from a separatepressure source.
 13. The device of claim 12, wherein the change deviceis a gooseneck, and wherein the operating power is arranged to be takendirectly from the gooseneck.
 14. The device of claim 10 wherein themember arranged to apply the adhesive or the binding agent comprisesseveral nozzles positioned in a fan-like formation in connection withthe gooseneck.
 15. A reeling device, comprising: a reeling core arrangedto receive a paper web around it to form a reel having a surface formedof said paper web; a reeling cylinder arranged in nip contact with saidreel so that the paper web passes through the nip and on to the reel toform said surface; means for bringing a new reeling core in nip contactwith said reeling cylinder; a cutting device of the paper web; and acentral processing unit connected to a member arranged to apply anadhesive or a binding agent and the central processing unit is connectedto the cutting device of the paper web, the central processing unitarranged to give a stopping control command before or simultaneouslywith starting the operation of the cutting device to said memberarranged to apply the adhesive or the binding agent, wherein the memberis arranged to apply the adhesive or the binding agent to the paper webwhich has passed through the nip and forms the reel surface.
 16. Areeling device, comprising: a reeling core arranged to receive a paperweb around it to form a reel having a surface formed of said paper web;a driven reeling cylinder arranged in nip contact with said reel, thepaper web passing over the reeling cylinder onto the reel at a firstnip; means for bringing a new reeling core in nip contact at a secondnip with said reeling cylinder; a cutting device of the paper webupstream of said first nip; and a member arranged to apply an adhesiveor a binding agent to the surface of the paper web which forms the reel,at a position downstream of said first nip during rotation of the reeland fixed to a change device used in threading of the paper web to thenew reeling core, wherein the member is arranged to apply the adhesiveor the binding agent in a direction away from the new reeling core andtoward the reel.
 17. The device of claim 16 wherein the member arrangedto apply the adhesive or the binding agent is positioned above the firstnip.